Clamp



J. P. DOLAN.

CLAMP. APPLICATION FILED AUG-20, 1919.

,34 Patented Aug. 10,1920.

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I Mj af ZM M awvenkm UNITED STATES PATENT "OFFICE.

JOHN P. DOLAN, OF HARTFORD, CONNECTICUT/ASSIGNOR OF TWO-THIRDS TO JOSEPHM. MOTTO, 0F HARTFORD, CONNECTICUT.

CLAMP.

Specification of Letters Patent.

Patented A g. 10, 1920.

Application filed August 20, 1919. Serial No. 318,650.

a citizen of the United States, residing at V Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Clamps, of which the following is a specification.

My invention relates to improvements 1n clamps of the form known assteel carpenters clamps and the object of'my improvement is simplicityand economy in construction and convenience and efliciency in use.

In the accompanying drawing Figure 1 is a side View of my improved clampin use for holding together two blocks of wood.

Fig. 2 is an end elevation of the same.

Fig. 3 is an elevation of the other end.

Fig. 4 is a sectional view on an enlarged scale and in part broken awayon the line lt of Fig. 3.

My improved clamp comprises an elongated bar 10 of rectangularcrosssect1on having fixedly secured at one end a bracket 11 thatoperatively supports a clamping screw 12 that operates a clampingcontact, piece 13 and having slidably engaged with the body portion anadjustable clamping member to be described.

The said adjustable clamping member comprises a block 14 that hasanopening 15 that is a sliding fit for the bar 10 and that overhangs thebar 10 on one side suitably to support a contact shoe 16 in a positionin opposition to the contact piece 13 so as to cooperate therewith inclamping the blocks of wood, as shown at 17, or other parts to be heldtogether.

The shoe 16 comprises a head 18 at the inner end, a neck or stem 19 ofappreciable size and of rectangular cross-section extending outwardlyfrom the said head 18, and a reduced stem 20 extending outwardly fromthe outer end of the said neck 19.

A collar 21 is mounted on the extreme outer end of the reduced stem 20and a coil spring 22 is mounted on the said reduced stem 20 andpositioned between the said collar 21 and the block 14.

The outer lateral edge 23 of the main stem or neck 19 is of appreciablelength and is directed longitudinally, in parallelism with the bar 10.

The inner lateral edge of the main stem 19, on the side opposed to thebar 10, has a 7 portion .24 of. appreciable length that is inclinedjortapered, suitably to cooperate with a sliding dog or looking piece 25for clamping the adjustable clamping structure to the bar 10.

The overhanging portion 26 of the block 14 is constructed and arrangedfor operatively housing the clamping shoe 16 in the following mannerz-Alongitudinally directed chamber 27, open on the inner side, is a fit forand receives the main stem 19, and has the'outer wall 28 perforated toprovide an opening 29 that is a fit for the reduced stem 20.

A laterally directed connecting chamber or passage 30 connects thechamber 27 with the opening 15 for the bar 10, and serves as the housingfor the dog 25.

The dog 25 is generally rectangular, has a contacting face 31 at theouter lateral end for cooperating with the inclined edge portion 24 ofthe stem 19, and at the inner end 32 is of suitable form for cooperatingwith the opposed edge portion of the bar 10, and has parallel sides 34that are a loose fit between the opposed end walls 33 of the passage 30.

The said opposed end walls 38 may be slightly rounded or V-shape so asto permit of a slight rocking movement of the dog 25 111 use.

The spring 22 tends to pull the shoe 16 outwardly and thereby effects apositioning of the dog 25 so as to be in contact with the bar 10, andany pressure on the shoe' 16 due to the pressure of the clamping screw12 operates to increase the hold on the bar.

hen the parts are in non-clamping position a slight pressure 011 thereduced stem 20 serves to release the parts so that the adjustableclamping member can be freely moved back and forth along the bar.

I claim as invention 1,. A clamp comprising a bar having a screwclamping member at one end and an adjustable clamping member for beingpositioned at different positions along the said bar, the saidadjustable clamping member comprising a body slidably engaged with thesaid bar, a shoe for contacting with the work that is slidably engagedwith the said body, and a dog positioned between the said shoe and barand housed in the said body,

and the said shoe having an inclined driving face that cooperates withthe said dog for driving the dog against the said bar.

2. A' clamp as described in claim 1, and the said adjustable clampingmember having a spring arranged to hold the parts in looking positionrelatively to the said bar.

3. In a clamp comprising a bar and a clamping member for beingpositioned at different positions along the said bar, the said clampingmember comprising a body that is slidably mounted on the said bar, ashoe for engaging with the Work and having a supporting portion that isslidably enapplied to the said shoe.

gaged with the said body, and being pro vided with an inclined edgeportion, the said body having a cavity in the portion between the saidinclined edge portion and the bar, and a wedge dog housed in the saidcavity for engaging with the said inclined edge portion on one side andwith the bar on the other side, and the parts being constructed andarranged so that the walls of the 'said cavity serve to position thesaid dog for effecting a locking of the clamping member to the barWhen-pressure is JOHN P. DOLAN.

